turn your expensive oscilloscope into a $5 clock

:

I remember hacking 6800 assembly code as a kid and tweaking R's and C's in my ramp generator until I had spelled out my name on the scope screen :-).

Somewhere on the world-wide-interweb is a 50's era article that shows how to synthesize some very nicely rendered digits onto a X-Y display using sine/cosine waves and harmonics.

Tim.

Check this out:

Your schematic has +5v connected directly to GND.

The project itself is cool, though.

Very nice... good use for that old Tek 2465B when you're not using it for Real Work! (Granted, someone like Joerg might suggest that the ratio of how often you use a 2465B to a digital 'scope tells you something about how good you are at circuit troubleshooting... :-) )

"DJ Delorie" a écrit dans le message de news: snipped-for-privacy@delorie.com...

Well spotted ! I should have named the topic "how to turn your expensive power supply into carbon". Schematic has been corrected ;-)

Thanks !

Bruno

Where?

to

Ah.

Reminds me of a late '70s Byte project for Space War (gravity and everything!) on a 'scope using an 8080. [scuttles off to dig out code and see if it is feasible to translate to PIC asm]

Well done.. Nice U Tube Video support

Fun is good

Regards

-- Walter Banks Byte Craft Limited Tel. (519) 888-6911 Fax (519) 746 6751

snipped-for-privacy@bytecraft.com

BrunoG wrote:

:

There was a nice article in the Proceedings of the IRE from the '50s about doing just that -- it was a lot like a QEX article from more recent times.

Regards,

Michael

Sorry, I was too busy using a $10,000.00 computer to replace a 99 cent pack of playing cards while playing solitaire...

--
Guy Macon

I ran a WAV of something like that on my oscilloscope. Too bad my soundcard is crummy.

Tim

-- Deep Fryer: A very philosophical monk. Website @

4

k

$10,000.00 computer? Are you interested in a used bridge, cheap?

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Nice. Hat down.

-- =^.^= StoneThrower

Look again. it's not to ground, or at least when I looked at it it wasn't.

--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

It sure looks like it's tied to ground.

Maybe you should reconsider this AND coupling capacitors.

I think you will find the small schematic on the page does have the power supply short. When you click it for the enlargement, you get the corrected version. Depending on your age and your monitor the one directly on the page is difficult to see if it is correct or not.

I would rather you sell me one of these for less than $10,000:

Dell PowerEdge 6800 server Quad 3.4GHz/800Mhz/16mb Cache, Dual-Core Intel Xeon 7140M CPUs

8GB, DDR2, 400MHz (8X1GB) Single Ranked DIMMs, (Mirrored, 4GB usable) Dual Power Supplies 24X IDE CD-RW/DVD ROM Drive Split HD Backplane 2X5 Hot-Pluggable Split HDD Backplane Dula PERC4DC-PCI Express controllers, 128MB Cache ea. Two 146GB 15KRPM SCSI U320 HotPlug Hard Drives (RAID-1[mirrored]) Three 300GB 10KRPM SCSI U320 HotPlug Hard Drives (RAID-5) Two Intel Pro 1000MT Dual Port Gigabit Network Adapters List price: $16,063 Price after Volume discount: $11,244

(I didn't add the cost of Redhat, VMWare, multiple Windows licenses, seperate NAS for backup, UPS, monitor, etc...)

BTW, I don't actually play Solitaire on a computer; until the above system gets installed it will be running a chess program -- and beating me badly every game. :)

--
Guy Macon

"BrunoG" wrote

Neat design, generating text in Y/T mode.

Let's be constructive:

With a small SW change you could put a needle ('invisible') pulse in each image trace at the point in time where the scope should start, the scope should be able to trigger on that. Just have enough time between images so the scope hold off time has finished (normally not more than 10..20% of the sweep time). For most scopes this removes the need for the trigger cable (which still makes thinks look as if you are doing X-Y control). For rotten scopes one could still connect the old trigger output.

Regards, Arie de Muynck